<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
       /*!*.box{*!*/
       /*!*    position:relative;*!*/
       /*!*    width: 100px;*!*/
       /*!*    height: 100px;*!*/
       /*!*    margin-left: 300px;*!*/
       /*!*    margin-top:90px;*!*/
       /*!*    background-color: #bbffaa;*!*/
       /*!* }*!*/
       /*!*.box4{*!*/
       /*!*    !*position:relative;*!*!*/
       /*!*    width: 210px;*!*/
       /*!*    height: 210px;*!*/
       /*!*    background-color: blue;*!*/

       /*}*/
       .box4{
           width: 800px;
           height: 800px;
           background-color: green;
       }
       .box,.box2,.box3{
           width: 100px;
           height: 100px;
           margin-left: 10px;
       }
       .box2{
           background-color: #bbffaa;
           float: left;
       }
       .box{
           background-color: orange;
           float: left;
       }
       .box3{
           background-color: rebeccapurple;
           float: left;
       }
    </style>
</head>
<body>
<div class="box4">
    <div class="box">box</div>
    <div class="box2">box2</div>
    <div class="box3">box3</div>
</div>
</body>
</html>